TM Series
Operating & Safety Instructions
USA – 05/11
Issue 01
24
4.5
BATTERIES AND CHARGING
BATTERIES MUST BE RECHARGED IN A WELL-VENTILATED AREA FREE OF
FLAME, SPARKS OR OTHER HAZARDS THAT MAY CAUSE EXPLOSION.
HIGHLY EXPLOSIVE HYDROGEN GAS IS PRODUCED DURING THE CHARGING
PROCESS.
Recharge batteries at the end of every working day or shift.
OPERATION
1)
Plug the charger into AC power.
2)
The LED on the charger will light, indicating charge current is flowing.
3)
The OBET chargers are equipped with an electronic timer. At the battery gassing threshold (2.3
volts per cell) the timer will activate and run for three hours. During this period the batteries are in
a gassing mode. (2.5 – 2.6 volts per cell max.). After three hours the charger will shut off.
Indicated by an extinguished LED.
4)
To disconnect the charger, unplug the AC power cord. Plugging the AC power back in will cause
the charger to repeat the cycle.
EQUALIZATION
When using multiple batteries in series, as on the TM34T and TM40, cells become uneven during
charge and discharge cycles. At least once a month perform two charge cycles back to back, this will
bring up cells that are lagging behind full charged cells and is important to overall battery performance.
TROUBLE SHOOTING
1) LED DOES NOT COME ON WHEN POWER IS APPLIED
Be sure you are plugged into a live circuit. Check the AC cord for breaks in the cord or plug. Check the
DC leads for breaks. Check the DC connections to the batteries. Clean if heavily corroded.
Place a volt meter across the battery terminals where the charger is connected. Apply AC power. If the
voltage rises on the batteries the charger is working and the LED is defective. NOTE: LED’s do not burn
out, but it has probably received a sharp blow causing physical damage. No harm will come from
operating the charger without a working LED.
2) LED STAYS ON
The batteries never reached the timer trip voltage and the charger was unable to gas and shut off. This
indicates several shorted cells. Overheating and excessive water usage are symptoms of this condition.
Performance will also be greatly diminished. Replace ant defective battery.
3) AC LINE OR CIRCUIT BREAKER BLOWS
Either the circuit breaker or fuse is weak, or the charger has shorted internally.
4) NO POWER IS PRESENT ACROSS THE DC LEADS WHEN A VOLT METER IS CONNECTED
The charger will not turn on until leads are connected to the batteries. Check correct polarity of the
batteries.
